btrace 实践笔记

import static com.sun.btrace.BTraceUtils.*;
import com.sun.btrace.annotations.*;
 
@BTrace public class TraceObject{
 
@TLS static long beginTime;
 
@OnMethod(
clazz="com.task.CheckTask",
method="getItem"
)
public static void traceBegin(){
beginTime = timeMillis();
}
 
@OnMethod(
clazz="com.task.CheckTask",
method="getItem",
location=@Location(Kind.RETURN)
)
public static void trace(long itemId,@Return Object result){
println("---------start-------------");
println(strcat("itemId:",str(itemId)));
println(strcat("result itemName:",str(get(field("com.info.ItemInfoDO","itemIdStr"),result))));
println(strcat(str(sizeof(result)),"bytes"));
println(strcat(strcat("execute time is:",str(timeMillis()-beginTime)),"ms"));
println("method stack:");
jstack();
println("---------end-------------");
}
}